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Kohler 18 HP Horizontal twin has surge when running.


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#1 GizPup OFFLINE  

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Posted September 14, 2010 - 12:59 PM

My craftsman GT6000 with 18 HP Horizontal twin has started to surge. The engine starts at once when cold and has a very slight surge then. As the engine gets warmer the surge gets worse. It also sputters under load. With tractor parked I can see the governor moving the throttle back and forth. Anyone had this problem before?

#2 olcowhand ONLINE  

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Posted September 14, 2010 - 01:35 PM

Sounds like carb cleaning time. Surging alone could be governor linkage/spring issues but the surging plus sputtering says dirty carb. FIRST be sure your spark plugs look good. These new EPA reg carbs have no adjustments for the jets. Used to a little varnish or crud....you could adjust it out, but these newer carbs have to be spotless or you start running bad. It's a very common problem and usually very easy to fix. Could also be a restriction in fuel delivery to the carb, so you may want to check fuel flow too. I gotta get back to unloading corn grain!

#3 jdslednut OFFLINE  

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Posted September 14, 2010 - 11:29 PM

While you have the carburetor off for a good cleaning replace the intake gasket while you're at it. I've solved a couple of hunting/surging issues with this. As mentioned in a previous thread, if you spray some WD40 around the intake gasket while the engine is running and you hear a difference in engine speed, the gasket is leaking.

#4 GizPup OFFLINE  

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Posted September 15, 2010 - 10:50 AM

Thanks, guys!
I cleaned the carb last night and today I got new gaskets, plugs and air filter. I checked the fuel pump flow before I put the gas line back on and it was good. I put everything together and the tractor started right up. I mowed my whole yard on a smooth running machine. Thanks again, GizPup.

#5 olcowhand ONLINE  

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Posted September 15, 2010 - 12:35 PM

Good deal GizPup, and thanks for updating us!

#6 jdslednut OFFLINE  

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Posted September 15, 2010 - 01:16 PM

Glad to hear a problem was solved!




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